BPI Air Conditioning & Heat Pump Professional Training Sample Slides ( ) Agenda

Transcription

1 BPI Air Conditioning & Heat Pump Professional Training Sample Slides ( ) Photo of scott at AC with guages 1 Agenda Day I Refrigerants Introductions Verifying Charge Super Heat Paperwork & Sign-In Subcooling Health and Safety The Lennox Approach Carbon Monoxide Method House as a System Weighing In The Refrigeration Cycle Refrigerant Leak Detection Air Conditioners Heat Pumps Refrigeration Tools Dehumidifiers Ventilation Evaporative Coolers Calculating BAS Metering Devices Calculating ASHRAE 62.2 Controls Ventilation Stratagies Building Ventilation 2 1

2 What You Will Learn Building Analysts/Raters or contractors Understand AC/HP s more Communicate better with HVAC professionals How to perform diagnostic tests on AC/HPs. This will be a broad overview of AC/HP s and the BPI Building Analyst and AC/HP Standards. This class will prepare you to become a certified BPI Air Conditioning and Heat Pump Professional! 3 Required BPI Tests for the AC/Heat Pump Professional Original Building Analyst Required Tests Moisture Evaluation Insulation Evaluation Blower Door Fuel Inspection Ambient CO Testing Worst Case Depressurization Venting Inspection Safety Device Inspection Spillage Test Draft Test Undiluted CO Test Flame Inspection Heat Exchanger Inspection Oven Testing Additional AC/Heat Pump Professional Required Tests Safety Device Inspection Room to Room Balancing Test Duct Blaster Test Not tested on DB this class System Charge Air Flow Measurement Stratagies 4 2

3 Other Necessary Trainings BPI Building Analyst Professional EPA 608 Type II Refrigerant License ACCA Manual J, S, T, D OSHA Safety Training EPA Lead Paint Training EPA Asbestos Training First Aid 5 HEALTH & SAFETY 6 3

4 Health & Safety #1 Priority in Weatherization/Retrofit Work To the occupants, yourself, your workers or the home! 7 BPI Standards Slide Information on slides with this design comes straight out of the BPI Standards. That means it s important! Remember, in this class BPI Standards are the law! Page X BPI Standards Y 8 4

5 BPI Health & Safety All technicians performing diagnostic tests, inspections, or installations, must have access to all necessary personal safety equipment required by OSHA. Required safety equipment includes, but is not limited to: Fitted respirators with canister filters Dust masks Gloves Protective clothing Safety glasses Hard hats (as required) Page 3 of the BPI Air Conditioning and Heat Pump Standards 9 Personal Protection Equipment (PPE) KEEP A CLEAN BAG Hardhat Gloves (latex, leather, mechanics) Respirator Dust mask Protective clothing First Aid Kit Flashlight: Headlamp = Hands Free 10 5

6 I m tough. I don t need personal protection equipment! 11 I m tough! I don t need personal protection equipment! 12 6

7 Material Safety Data Sheet Exercise If you have any trouble finding the proper MSDS sheets for your materials you can look online at sites such as 13 Fire Hazards Flues without proper clearances Non-IC rated can lights Knob and tube wiring Fuel containers too close to heat sources Gas leaks Chemicals that can react with oxidizers Poor electrical connections Fuel storage leaks Clogged dryer vents Whole house fans 14 7

8 The House as a System Multiple Systems Pressure boundary Thermal boundary Heating & Cooling Ventilation Appliances Homeowners Mother Nature 15 Grandma s House 16 8

9 AC/HP s move heat, not make it. I n s i d e C O u t s i d e 17 Split System Heat Pump 18 9

10 Air Handling Unit (AHU) Parts and Pieces Refrigerant Liquid Line Refrigerant Suction Line Main Power Supply Fan A Coils & Metering Device Condensate Pump Condensate Drain 19 Evaporator Coil 20 10

11 Image courtesy of BWES Plugged A/C drain lines can cause bulk moisture. Be especially wary of these when unit is in attic. 21 Outdoor Unit Condenser Coil Compressor Refrigerant Suction Line Refrigerant Liquid Line Refrigerant Reservoir 22 11

12 Diaphragm Metering Devices TXV Temperature Sensing Bulb Refrigerant Flow Temperature Adjustment Spring Solenoid 23 Pressure/Temperature Charts PSIG R-22 R-134A R-410A

13 Checking Refrigerant Charge Superheat 25 No Action Required CFM Recommend Difference 1082 BAS Tree N-Factor CFM Natural 100% X 70% 72.1 Require 100% CFM-Natural 26 13

14 Blower Door Testing Testing Out When air sealing, enclosed cavity insulation representing 15% or more of the total building shell area, or sealing of the ducts outside the thermal envelope are recommended, the work scope must include pre and post-installation blower door tests. Page 3 of the BPI Building Analyst

15 Ventilation Standards ASHRAE CFM/Person total 0.35 ACH Volume based on profile PROFILE ASHRAE CFM/Person mechanical 1 CFM/100 ft 2 Volume based on footprint FOOTPRINT Common Problems with Ventilation Fans 30 15

16 This fan vents directly to the attic, causing moisture problems and windwashing. 31 Improper Termination 32 16

17 Venting exhaust fans to the ridge vent can cause condensation in winter, creating moisture issues. 33 Attic Ventilation Example Attic Area: 1,800 ft 2 WITH VDR: Ventilation Area = Attic Area/300 VA = 1,800 ft 2 / 300 VA = 6 ft 2 WITHOUT VDR: Ventilation Area = Attic Area/300 VA = 1,800 ft 2 / 150 VA = 12 ft

18 Unventilated Attics By insulating the underside of the roof with foam and air sealing all vents you have essentially moved the Envelope from the attic floor to the attic ceiling 35 How Relative Humidity Changes Ducts: 55 F Pipes: 55 F Floor: 60 F Ambient Temp: 85 F Relative Humidity: 61% Dew Point: 70 F Ambient Temp: 73 F Relative Humidity: 91% Dew Point: 70 F 36 18

19 So what s wrong with code compliant vented crawl spaces? 37 ACCA System Design Process Manual J = Load Calculation Manual S = Equipment Selection Manual D = Duct Size Calculation Manual T = Air Distribution 19

20 Typical Manual J Input Screen Typical Manual J Building Summary Total Load 20

21 Service connections are an area of higher pressure and should not be overlooked during duct sealing. It is the point of highest pressure, so leaks are magnified here. 21

22 Sealing Plenum-Duct Connections Apply fiberglass mesh tape to the plenum connection Apply a liberal amount of mastic 22

23 Slip on the flex duct and zip tie firmly. Things You Might Find Under a Floor Register 23

24 Frozen A-Coil If you don t check system air flow before sealing ducts you might starve the coil! Checking Airflow Duct Tester This test uses the Pressure Matching technique. Pro Perhaps the most accurate test Can capture all airflow at the AHU Con Expensive equipment Set-up is important Can be difficult to set up in some cases 24

25 Compare the temperature rise/drop between the return and supply plenum at steady state Pro Accurate/industry accepted Inexpensive Con Set-up is important and sometimes difficult Checking Airflow Heat Rise Supply Plenum Thermometer Placement AC Coil Furnace Return Plenum Blower Box Duct Leakage and Pressure Return Leaks Pressurize the Envelope Supply Leaks Depressurize the Envelope 25

26 Room to Room Pressure Testing Example 26